MARINE GAMMARIDEAN AMPHIPODA 447 



formerly sjnionyinoiis ^nth Metopa and Stenothoe, for his key points 

 out the fact that Proboloides and Metopoides are characterized only 

 by the presence or absence of an accessory flagelliim. Because Pro- 

 metopa and Microstenothoe bear accessory flagella, it is inconsistent 

 to reduce them without also eliminating the genera Proboloides and 

 Metopoides. 



Nomenclatural Changes in Stenothoidae 



Mesostenothoides Gurjanova (1938) is removed to Stenothoides. 

 Metopoides Delia Valle (1893) (Stebbing, 1906) is reestablished. 

 Metopella nasutigenes (Stebbing, 1888) is removed to Probolisca. 

 Microstenothoe Pirlot (1933b) is reestablished. 

 Parametopella stelleri Gurjanova (1948) omitted from index by J. L. 



Barnard (1958a). 

 Parametopella minuta (Holmes), erroneously assigned to this genus, is 



removed to Stenothoe. 

 Prometopa Schellenberg (1931) is reestablished. 

 Stenothoe minuta Holmes, (Stebbing, 1906; Kunkel, 1918), erroneously 



assigned to Parametopella previously. 

 Stenula J. L. Barnard (1962c) was erected for species previously 



assigned to Mesostenothoides. 



Key to the Genera of Stenothoidae 



(emended after Shoemaker, 1955) 



1. Pereopods 4 and 5: article 2 linear (figs. 162<,y) Key A 



Pereopod 4: article 2 linear (fig. 162z;); pereopod 5, article 2 expanded (figs. 



162s,u) Key B 



Pereopods 4 and 5: article 2 expanded (figs. 162o,m) Key C 



KEY A 



1. Palp of maxilla 1 uniarticulate (fig. 162gf) 2 



Palp of maxilla 1 biarticulate (fig. 162/i) Probolisca 



2. Mandibular palp absent (fig. 162c) Parametopella 



Mandibular palp 1-articulate Metopelloides 



Mandibular palp 2- or 3-articulate (fig. 162d) Metopella 



Figure 162. — Stenothoidae: a, Stenothoe marina (Bate) (Sars, 1895, pi. 80). Upper lip: 

 b, Stenothoe. Mandible: c, Stenothoe; d, Proboloides gregarius (Sars, 1895, pi. 84). Lower 

 lip: e, Stenothoe; f, Proboloides. Maxilla 1: g, Metopa alderi (Bate) (Sars, 1895, pi. 86); 

 h, Stenothoe. Maxilla 2: i, Stenothoe. Maxilliped:;, Stenothoe; k, Metopa; I, Proboloides. 

 Gnathopod 1: m, Metopa pusilla (Sars, 1895, pi. 90); n, Metopa alderi; o, Metopa robusta 

 (Sars, 1895, pi. 96). Gnathopod 2: p, Metopella longimana (Boeck) (Sars, 1895, pi. 97); q, 

 Metopa alderi. Tdson: r, Stenothoe. Pereopod S: s, Mesometopa neglecta (iia.nsen) (Sars, 

 1895, pi. 97); t, Metopella; u, Stenothoe. Pereopod 4: f, Metopella. Uropod 3 : w, Stenothoe. 



